I got there late- the event is two and a half hours long and you really do need the whole time to feel like you've accomplished much. (And take time out to eat and rehydrate.) So I got through a few of the Yamahais and decided they weren't tasting well with me, then I checked out most of the Daiginjos (that was a lot of work) and just a few of the Ginjos.
I only made notes on my program when I really liked something, but this year overheard other people with a better system- they rated all the sakes on a 1-5 or other scale. That way I could see not only what I liked, but what I didn't. It seems kind of obvious, but I'm not master of that. Next year, I'll really have my act together.